George



(No Model.)

G. B. PRESCOTT, Jr. I DISTRIBUTION OF ELECTRICITY BY SECONDARY BATTERIES.

No. 402,190. Patented Apr. 30, 1889..-

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W 61 8543 It W UNITED STATES PATENT OFEIcE.

GEORGE B. PRESCOTT, JR, OF XEiYARK, NE\V JERSEY, r SSIGNOR TO THE ELECTRICAL AGCUM ULATOR COMPANY, OF NEV YORK.

DlSTRlBUTION OF ELECTRICITY BY SECONDARY BATTERIES.

SPECIFICATION forming part of Letters Patent No. 402,190, dated April 80, 1889.

Application filed February '7, 1889. $eriel N01 298,975. (No model.)

To (LZZ 10710711 it may concern:

Be it known that I, GEORGE jlnnsco'r'r, Jr., a citizen oil the United'States, and aresident of. Newark, in the county of Essex and State of Xew Jersey, have invented certain new and useful Improvements in Distribw tion of Electricity by Secondary Batteries, of which the following is a specification.

My invention relates to the distribution. of electricity through the medium of secondary batteries or accumulators.

The inyention consists in an arrangement of one or more dynamos in parallel circuit with one or more series of cells of secondary battery and a workingcircuit containing translating devices to be supplied from either or both such sources of electrical energy.

The accompanying drawing illustrates my invention.

D D aredynanro-electric machines supplied with regulating devices R R. One terminal of each dynamo connected to the main lead 2. The second terminal of cit-her or both may be connected. with the main lead 1 or an auxiliarylead, (Lby operatin g the hand-switchcs s or s.

u: is a worhing-circuit containingiamps 1, connected with the main leads 1. and 2 at points outside the point of connection between the auxiliary lead (I and main lead 1.

ln. anxiliaryload (l isplaced an adjustable resistance, Z.

B and B are two series 0i cells of secondary battery equal in luimber. Ono terminal of each series is connected. to the main lead Switches and s are arranged. to furnish connection between the second terminal. of each series of cells and either main lead 1 or auxiliary lead C, Between switches 5* and s in a circuit common to the circuit of both and to auxiliary lead C there is an automatic circuit-ln-eaker, )1, operating to divide said circuit upon a change in the direction of cur= rent or upon a failure of such current. Bo-

tween each series of cells and its switch 5 or .5 there is a switch, S, for varying the number of cells in the series, an. adjustable artificial resistance, or 1:, an overdiseliarge-switch, O or O, a voltmeter, K, and an instrument, 1', for indicating the direction in which current is figuring.

I will assume that normally one or both dynamos I) D are connected with the main leads 1 and 73 and are supplyinglamps l in the workingalirenit 21. It more current is shown to be passing through ammeter a than is utilizcd at the lamps .l, I may connect a series of cells with the dynamo to receive a current of charge. To charge this series of cells, which in number are sutiicient to supply a counter elcctro-n'rotive force equal to that due to the dynanio,l must raise the electrounotive force of the dynamo, say, one-half volt for every cell of battery; but this would be injurious to the lamps. l therefore connect the dynamo and battery to auxiliarylead C, breaking the normal connection with lead 1, and I adjust the artificial resistance Z to an amount sufiicient to produce a drop in the electromotive force manifest at the lam )-terminals to the normal point. By moving switch .9 I may connect a second series of cells, B, in parallel with the first and with. the dynamos, for the purpose of charging. After the batteries are charged 1 disconnect the dynamos, 7 5 and, by changing the switches s s',l connect the batteries with main lead 1, having no artificial resistance to cause a drop in the elcctrounotiyc force. By the use of this arrangelnent of apparatus the batteries may be connected to the dynamos for charging or to the worhing-circu.it for discharging by simply changing their connections from the main. lead 1 to the auxiliary lead. C.

Th e adjustable artifi cial resistances .1; and 0c, 8 5 each in circuit wit-h a battery, are for Varying the current flowing in or out of the battery branch circuit with which it is connected. This is useful and necessary when two or more series of batteries are connected in par- 0 allel circuit, because otherwise the electrolnotive force or internal resistance of one series varying slightly from that of the other would result injuriously to the battery having a lower electrounotive force. The resist- 9 5 ances are used to regulate tor fractional parts of the unit of change-l c., two volts-which unit of change is produced by operating the switches or S.

By the arrangement of apparatus shown 10c and described the operations of a lightingplant aresimplified, and errors in cmrncctions or the. proportioning of current are rendered as remote as possible, even when under the control of unskilled labor.

What I claim, and desire to secure by Letters Patent, is

1. The combination of a dynamo-electric machine, two main leads therefor, a workingcircuit containing lamps, one or more series of cells of secondary battery, an auxiliary lead containin gan artificial resistance,an dswitches for changing the batteries and dynamos from one lead to the other for the purpose of charging and discharging, substantially as de scribed. I

2. The combination of two or more dynamoelectric machines connected in multiple arc, main leads therefor, a working-circuit containing lamps in multiple arc, two or more series of cells of secondary battery in parallel cir- 2o cuit, with their opposite terminals connected to the main leads, respectively, whereby both dynamos and batteries supply the workingcircuit, a switch in each battery branch for varying the number of cells in circuit, and a switch in each dynamo branch to connect and disconnect either dynamo with respect to the main leads, substantially as described.

3. The combination of a dynamo-electric machine, main leads therefor, two or more series of cells of secondary battery connected in parallel circuit with each other, and an adjustable artificial resistance in circuit with.

each battery to compensate for fractional differences in the electro-motive force between each series, substantially as described.

GEORGE E. PRESCOTT, JR. 

